Image of a brain cheering

CryptoHack

A free, fun platform for learning modern cryptography

Image of a cloud pouring information into a head

Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

Level up image of a warrior

Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

New ideas in development

Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 Sanji 2850
#2 Hikibk 2100
#3 kei 2085
#4 picokatx 2025
#5 aquacat 1740
Recent Solves
Finding Flags DANDIVS
Euler's Totient Karun
Hex hamzaKACEM04
Public Keys Karun
ASCII Oliverdibs
Recent Solutions
XOR Properties nim22 0
ECB Oracle Bitraven 0
Bringing It All Together codewithwan 0
Chinese Remainder Theorem natronite 0
Confusion through Substitution codewithwan 0

Level Up

level up icon

You are now level Current level